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  源码分析
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  基础案例
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<blockquote><p>在上一篇《[强大的Stream API，你了解吗？.md](/md/java/java8/2022-03-31-009-强大的Stream API，你了解吗？.md)》中，一名读者去面试被面试官暴虐！归根结底，那哥儿们还是对Java8的新特性不是很了解呀！那么，我们继续讲述Java8的新特性，旨在最终可以让每位读者在跳槽面试的过程中吊打面试官！！</p></blockquote> <h2 id="stream的中间操作"><a href="#stream的中间操作" class="header-anchor">#</a> Stream的中间操作</h2> <p>多个中间操作可以连接起来形成一个流水线，除非流水线上触发终止操作，否则中间操作不会执行任何的处理！而在终止操作时一次性全部处理，称为“惰性求值” 。  Stream的中间操作是不会有任何结果数据输出的。</p> <p>Stream的中间操作在整体上可以分为：筛选与切片、映射、排序。接下来，我们就分别对这些中间操作进行简要的说明。</p> <h2 id="筛选与切片"><a href="#筛选与切片" class="header-anchor">#</a> 筛选与切片</h2> <p>这里，我将与筛选和切片有关的操作整理成如下表格。</p> <table><thead><tr><th>方法</th> <th>描述</th></tr></thead> <tbody><tr><td>filter(Predicate p)</td> <td>接收Lambda表达式，从流中排除某些元素</td></tr> <tr><td>distinct()</td> <td>筛选，通过流所生成元素的 hashCode() 和 equals() 去 除重复元素</td></tr> <tr><td>limit(long maxSize)</td> <td>截断流，使其元素不超过给定数量</td></tr> <tr><td>skip(long n)</td> <td>跳过元素，返回一个扔掉了前 n 个元素的流。若流中元素 不足 n 个，则返回一个空流。与 limit(n) 互补</td></tr></tbody></table> <p>接下来，我们列举几个简单的示例，以便加深理解。</p> <p>为了更好的测试程序，我先构造了一个对象数组，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">protected</span> <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Employee</span><span class="token punctuation">&gt;</span></span> list <span class="token operator">=</span> <span class="token class-name">Arrays</span><span class="token punctuation">.</span><span class="token function">asList</span><span class="token punctuation">(</span>
    <span class="token keyword">new</span> <span class="token class-name">Employee</span><span class="token punctuation">(</span><span class="token string">&quot;张三&quot;</span><span class="token punctuation">,</span> <span class="token number">18</span><span class="token punctuation">,</span> <span class="token number">9999.99</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token keyword">new</span> <span class="token class-name">Employee</span><span class="token punctuation">(</span><span class="token string">&quot;李四&quot;</span><span class="token punctuation">,</span> <span class="token number">38</span><span class="token punctuation">,</span> <span class="token number">5555.55</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token keyword">new</span> <span class="token class-name">Employee</span><span class="token punctuation">(</span><span class="token string">&quot;王五&quot;</span><span class="token punctuation">,</span> <span class="token number">60</span><span class="token punctuation">,</span> <span class="token number">6666.66</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token keyword">new</span> <span class="token class-name">Employee</span><span class="token punctuation">(</span><span class="token string">&quot;赵六&quot;</span><span class="token punctuation">,</span> <span class="token number">8</span><span class="token punctuation">,</span> <span class="token number">7777.77</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    <span class="token keyword">new</span> <span class="token class-name">Employee</span><span class="token punctuation">(</span><span class="token string">&quot;田七&quot;</span><span class="token punctuation">,</span> <span class="token number">58</span><span class="token punctuation">,</span> <span class="token number">3333.33</span><span class="token punctuation">)</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br></div></div><p>其中，Employee类的定义如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@Data</span>
<span class="token annotation punctuation">@Builder</span>
<span class="token annotation punctuation">@ToString</span>
<span class="token annotation punctuation">@NoArgsConstructor</span>
<span class="token annotation punctuation">@AllArgsConstructor</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">Employee</span> <span class="token keyword">implements</span> <span class="token class-name">Serializable</span> <span class="token punctuation">{</span>
    <span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token keyword">final</span> <span class="token keyword">long</span> serialVersionUID <span class="token operator">=</span> <span class="token operator">-</span><span class="token number">9079722457749166858L</span><span class="token punctuation">;</span>
    <span class="token keyword">private</span> <span class="token class-name">String</span> name<span class="token punctuation">;</span>
    <span class="token keyword">private</span> <span class="token class-name">Integer</span> age<span class="token punctuation">;</span>
    <span class="token keyword">private</span> <span class="token class-name">Double</span> salary<span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br></div></div><p>Employee类的定义比较简单，这里，我就不赘述了。之后的示例中，我们都是使用的Employee对象的集合进行操作。好了，我们开始具体的操作案例。</p> <h3 id="_1-filter-方法"><a href="#_1-filter-方法" class="header-anchor">#</a> 1.filter()方法</h3> <p>filter()方法主要是用于接收Lambda表达式，从流中排除某些元素，其在Stream接口中的源码如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token class-name">Stream</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">filter</span><span class="token punctuation">(</span><span class="token class-name">Predicate</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span> <span class="token keyword">super</span> <span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> predicate<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>可以看到，在filter()方法中，需要传递Predicate接口的对象，Predicate接口又是个什么鬼呢？点进去看下源码。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token annotation punctuation">@FunctionalInterface</span>
<span class="token keyword">public</span> <span class="token keyword">interface</span> <span class="token class-name">Predicate</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token punctuation">{</span>

    <span class="token keyword">boolean</span> <span class="token function">test</span><span class="token punctuation">(</span><span class="token class-name">T</span> t<span class="token punctuation">)</span><span class="token punctuation">;</span>

    <span class="token keyword">default</span> <span class="token class-name">Predicate</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">and</span><span class="token punctuation">(</span><span class="token class-name">Predicate</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span> <span class="token keyword">super</span> <span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> other<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token class-name">Objects</span><span class="token punctuation">.</span><span class="token function">requireNonNull</span><span class="token punctuation">(</span>other<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">return</span> <span class="token punctuation">(</span>t<span class="token punctuation">)</span> <span class="token operator">-&gt;</span> <span class="token function">test</span><span class="token punctuation">(</span>t<span class="token punctuation">)</span> <span class="token operator">&amp;&amp;</span> other<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span>t<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token keyword">default</span> <span class="token class-name">Predicate</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">negate</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token punctuation">(</span>t<span class="token punctuation">)</span> <span class="token operator">-&gt;</span> <span class="token operator">!</span><span class="token function">test</span><span class="token punctuation">(</span>t<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    
    <span class="token keyword">default</span> <span class="token class-name">Predicate</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">or</span><span class="token punctuation">(</span><span class="token class-name">Predicate</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span> <span class="token keyword">super</span> <span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> other<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token class-name">Objects</span><span class="token punctuation">.</span><span class="token function">requireNonNull</span><span class="token punctuation">(</span>other<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">return</span> <span class="token punctuation">(</span>t<span class="token punctuation">)</span> <span class="token operator">-&gt;</span> <span class="token function">test</span><span class="token punctuation">(</span>t<span class="token punctuation">)</span> <span class="token operator">||</span> other<span class="token punctuation">.</span><span class="token function">test</span><span class="token punctuation">(</span>t<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    
    <span class="token keyword">static</span> <span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token class-name">Predicate</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">isEqual</span><span class="token punctuation">(</span><span class="token class-name">Object</span> targetRef<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token punctuation">(</span><span class="token keyword">null</span> <span class="token operator">==</span> targetRef<span class="token punctuation">)</span>
                <span class="token operator">?</span> <span class="token class-name">Objects</span><span class="token operator">::</span><span class="token function">isNull</span>
                <span class="token operator">:</span> object <span class="token operator">-&gt;</span> targetRef<span class="token punctuation">.</span><span class="token function">equals</span><span class="token punctuation">(</span>object<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br></div></div><p>可以看到，Predicate是一个函数式接口，其中接口中定义的主要方法为test()方法，test()方法会接收一个泛型对象t，返回一个boolean类型的数据。</p> <p>看到这里，相信大家明白了：filter()方法是根据Predicate接口的test()方法的返回结果来过滤数据的，如果test()方法的返回结果为true，符合规则；如果test()方法的返回结果为false，则不符合规则。</p> <p>这里，我们可以使用下面的示例来简单的说明filter()方法的使用方式。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//内部迭代：在此过程中没有进行过迭代，由Stream api进行迭代</span>
<span class="token comment">//中间操作：不会执行任何操作</span>
<span class="token class-name">Stream</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Person</span><span class="token punctuation">&gt;</span></span> stream <span class="token operator">=</span> list<span class="token punctuation">.</span><span class="token function">stream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token operator">-&gt;</span> <span class="token punctuation">{</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span><span class="token string">&quot;Stream API 中间操作&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> e<span class="token punctuation">.</span><span class="token function">getAge</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&gt;</span> <span class="token number">30</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><p>我们，在执行终止语句之后，一边迭代，一边打印，而我们并没有去迭代上面集合，其实这是内部迭代，由Stream API 完成。</p> <p>下面我们来看看外部迭代，也就是我们人为得迭代。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//外部迭代</span>
<span class="token class-name">Iterator</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Person</span><span class="token punctuation">&gt;</span></span> it <span class="token operator">=</span> list<span class="token punctuation">.</span><span class="token function">iterator</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">while</span> <span class="token punctuation">(</span>it<span class="token punctuation">.</span><span class="token function">hasNext</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
    <span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token punctuation">.</span><span class="token function">println</span><span class="token punctuation">(</span>it<span class="token punctuation">.</span><span class="token function">next</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br></div></div><h3 id="_2-limit-方法"><a href="#_2-limit-方法" class="header-anchor">#</a> 2.limit()方法</h3> <p>主要作用为：截断流，使其元素不超过给定数量。</p> <p>先来看limit方法的定义，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token class-name">Stream</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">limit</span><span class="token punctuation">(</span><span class="token keyword">long</span> maxSize<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>limit()方法在Stream接口中的定义比较简单，只需要传入一个long类型的数字即可。</p> <p>我们可以按照如下所示的代码来使用limit()方法。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//过滤之后取2个值</span>
list<span class="token punctuation">.</span><span class="token function">stream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">filter</span><span class="token punctuation">(</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token operator">-&gt;</span> e<span class="token punctuation">.</span><span class="token function">getAge</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&gt;</span><span class="token number">30</span> <span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">limit</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span>out <span class="token operator">::</span> <span class="token function">println</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>在这里，我们可以配合其他得中间操作，并截断流，使我们可以取得相应个数得元素。而且在上面计算中，只要发现有2条符合条件得元素，则不会继续往下迭代数据，可以提高效率。</p> <h3 id="_3-skip-方法"><a href="#_3-skip-方法" class="header-anchor">#</a> 3.skip()方法</h3> <p>跳过元素，返回一个扔掉了前 n 个元素的流。若流中元素 不足 n 个，则返回一个空流。与 limit(n) 互补。</p> <p>源码定义如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token class-name">Stream</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">skip</span><span class="token punctuation">(</span><span class="token keyword">long</span> n<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>源码定义比较简单，同样只需要传入一个long类型的数字即可。其含义是跳过n个元素。</p> <p>简单示例如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//跳过前2个值</span>
list<span class="token punctuation">.</span><span class="token function">stream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">skip</span><span class="token punctuation">(</span><span class="token number">2</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span>out <span class="token operator">::</span> <span class="token function">println</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><h3 id="_4-distinct-方法"><a href="#_4-distinct-方法" class="header-anchor">#</a> 4.distinct()方法</h3> <p>筛选，通过流所生成元素的 hashCode() 和 equals() 去 除重复元素。</p> <p>源码定义如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token class-name">Stream</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">distinct</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>旨在对流中的元素进行去重。</p> <p>我们可以如下面的方式来使用disinct()方法。</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>list.stream().distinct().forEach(System.out :: println);
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p><strong>这里有一个需要注意的地方：distinct 需要实体中重写hashCode（）和 equals（）方法才可以使用。</strong></p> <h2 id="映射"><a href="#映射" class="header-anchor">#</a> 映射</h2> <p>关于映射相关的方法如下表所示。</p> <table><thead><tr><th>方法</th> <th>描述</th></tr></thead> <tbody><tr><td>map(Function f)</td> <td>接收一个函数作为参数，该函数会被应用到每个元 素上，并将其映射成一个新的元素。</td></tr> <tr><td>mapToDouble(ToDoubleFunction f)</td> <td>接收一个函数作为参数，该函数会被应用到每个元 素上，产生一个新的 DoubleStream。</td></tr> <tr><td>mapToInt(ToIntFunction f)</td> <td>接收一个函数作为参数，该函数会被应用到每个元 素上，产生一个新的 IntStream。</td></tr> <tr><td>mapToLong(ToLongFunction f)</td> <td>接收一个函数作为参数，该函数会被应用到每个元 素上，产生一个新的 LongStream</td></tr> <tr><td>flatMap(Function f)</td> <td>接收一个函数作为参数，将流中的每个值都换成另 一个流，然后把所有流连接成一个流</td></tr></tbody></table> <h3 id="_1-map-方法"><a href="#_1-map-方法" class="header-anchor">#</a> 1.map()方法</h3> <p>接收一个函数作为参数，该函数会被应用到每个元 素上，并将其映射成一个新的元素。</p> <p>先来看Java8中Stream接口对于map()方法的声明，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">R</span><span class="token punctuation">&gt;</span></span> <span class="token class-name">Stream</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">R</span><span class="token punctuation">&gt;</span></span> <span class="token function">map</span><span class="token punctuation">(</span><span class="token class-name">Function</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span> <span class="token keyword">super</span> <span class="token class-name">T</span><span class="token punctuation">,</span> <span class="token operator">?</span> <span class="token keyword">extends</span> <span class="token class-name">R</span><span class="token punctuation">&gt;</span></span> mapper<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>我们可以按照如下方式使用map()方法。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">//将流中每一个元素都映射到map的函数中，每个元素执行这个函数，再返回</span>
<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> list <span class="token operator">=</span> <span class="token class-name">Arrays</span><span class="token punctuation">.</span><span class="token function">asList</span><span class="token punctuation">(</span><span class="token string">&quot;aaa&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;bbb&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;ccc&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;ddd&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
list<span class="token punctuation">.</span><span class="token function">stream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token operator">-&gt;</span> e<span class="token punctuation">.</span><span class="token function">toUpperCase</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token operator">::</span><span class="token function">printf</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//获取Person中的每一个人得名字name，再返回一个集合</span>
<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> names <span class="token operator">=</span> <span class="token keyword">this</span><span class="token punctuation">.</span>list<span class="token punctuation">.</span><span class="token function">stream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token class-name">Person</span> <span class="token operator">::</span> <span class="token function">getName</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">collect</span><span class="token punctuation">(</span><span class="token class-name">Collectors</span><span class="token punctuation">.</span><span class="token function">toList</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br></div></div><h3 id="_2-flatmap"><a href="#_2-flatmap" class="header-anchor">#</a> 2.flatMap()</h3> <p>接收一个函数作为参数，将流中的每个值都换成另 一个流，然后把所有流连接成一个流。</p> <p>先来看Java8中Stream接口对于flatMap()方法的声明，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">R</span><span class="token punctuation">&gt;</span></span> <span class="token class-name">Stream</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">R</span><span class="token punctuation">&gt;</span></span> <span class="token function">flatMap</span><span class="token punctuation">(</span><span class="token class-name">Function</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span> <span class="token keyword">super</span> <span class="token class-name">T</span><span class="token punctuation">,</span> <span class="token operator">?</span> <span class="token keyword">extends</span> <span class="token class-name">Stream</span><span class="token punctuation">&lt;</span><span class="token operator">?</span> <span class="token keyword">extends</span> <span class="token class-name">R</span><span class="token punctuation">&gt;</span><span class="token punctuation">&gt;</span></span> mapper<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>我们可以使用如下方式使用flatMap()方法，为了便于大家理解，这里，我就贴出了测试flatMap()方法的所有代码。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">/**
     * flatMap —— 接收一个函数作为参数，将流中的每个值都换成一个流，然后把所有流连接成一个流
     */</span>
    <span class="token annotation punctuation">@Test</span>
    <span class="token keyword">public</span> <span class="token keyword">void</span> testFlatMap <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token class-name">StreamAPI_Test</span> s <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">StreamAPI_Test</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> list <span class="token operator">=</span> <span class="token class-name">Arrays</span><span class="token punctuation">.</span><span class="token function">asList</span><span class="token punctuation">(</span><span class="token string">&quot;aaa&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;bbb&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;ccc&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;ddd&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        list<span class="token punctuation">.</span><span class="token function">stream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">flatMap</span><span class="token punctuation">(</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token operator">-&gt;</span> s<span class="token punctuation">.</span><span class="token function">filterCharacter</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token operator">::</span><span class="token function">println</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

        <span class="token comment">//如果使用map则需要这样写</span>
        list<span class="token punctuation">.</span><span class="token function">stream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">map</span><span class="token punctuation">(</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token operator">-&gt;</span> s<span class="token punctuation">.</span><span class="token function">filterCharacter</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token punctuation">(</span>e<span class="token punctuation">)</span> <span class="token operator">-&gt;</span> <span class="token punctuation">{</span>
            e<span class="token punctuation">.</span><span class="token function">forEach</span><span class="token punctuation">(</span><span class="token class-name">System</span><span class="token punctuation">.</span>out<span class="token operator">::</span><span class="token function">println</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>

    <span class="token comment">/**
     * 将一个字符串转换为流
     */</span>
    <span class="token keyword">public</span> <span class="token class-name">Stream</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Character</span><span class="token punctuation">&gt;</span></span> <span class="token function">filterCharacter</span><span class="token punctuation">(</span><span class="token class-name">String</span> str<span class="token punctuation">)</span><span class="token punctuation">{</span>
        <span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Character</span><span class="token punctuation">&gt;</span></span> list <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ArrayList</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">for</span> <span class="token punctuation">(</span><span class="token class-name">Character</span> ch <span class="token operator">:</span> str<span class="token punctuation">.</span><span class="token function">toCharArray</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
            list<span class="token punctuation">.</span><span class="token function">add</span><span class="token punctuation">(</span>ch<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        <span class="token keyword">return</span> list<span class="token punctuation">.</span><span class="token function">stream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br></div></div><p>其实map方法就相当于Collaction的add方法，如果add的是个集合得话就会变成二维数组，而flatMap 的话就相当于Collaction的addAll方法，参数如果是集合得话，只是将2个集合合并，而不是变成二维数组。</p> <h2 id="排序"><a href="#排序" class="header-anchor">#</a> 排序</h2> <p>关于排序相关的方法如下表所示。</p> <table><thead><tr><th>方法</th> <th style="text-align:center;">描述</th></tr></thead> <tbody><tr><td>sorted()</td> <td style="text-align:center;">产生一个新流，其中按自然顺序排序</td></tr> <tr><td>sorted(Comparator comp)</td> <td style="text-align:center;">产生一个新流，其中按比较器顺序排序</td></tr></tbody></table> <p>从上述表格可以看出：sorted有两种方法，一种是不传任何参数，叫自然排序，还有一种需要传Comparator 接口参数，叫做定制排序。</p> <p>先来看Java8中Stream接口对于sorted()方法的声明，如下所示。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token class-name">Stream</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">sorted</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token class-name">Stream</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> <span class="token function">sorted</span><span class="token punctuation">(</span><span class="token class-name">Comparator</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token operator">?</span> <span class="token keyword">super</span> <span class="token class-name">T</span><span class="token punctuation">&gt;</span></span> comparator<span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>sorted()方法的定义比较简单，我就不再赘述了。</p> <p>我们也可以按照如下方式来使用Stream的sorted()方法。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token comment">// 自然排序</span>
<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Employee</span><span class="token punctuation">&gt;</span></span> persons <span class="token operator">=</span> list<span class="token punctuation">.</span><span class="token function">stream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">sorted</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">collect</span><span class="token punctuation">(</span><span class="token class-name">Collectors</span><span class="token punctuation">.</span><span class="token function">toList</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>

<span class="token comment">//定制排序</span>
<span class="token class-name">List</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">Employee</span><span class="token punctuation">&gt;</span></span> persons1 <span class="token operator">=</span> list<span class="token punctuation">.</span><span class="token function">stream</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">sorted</span><span class="token punctuation">(</span><span class="token punctuation">(</span>e1<span class="token punctuation">,</span> e2<span class="token punctuation">)</span> <span class="token operator">-&gt;</span> <span class="token punctuation">{</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span>e1<span class="token punctuation">.</span><span class="token function">getAge</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">==</span> e2<span class="token punctuation">.</span><span class="token function">getAge</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token number">0</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token keyword">if</span> <span class="token punctuation">(</span>e1<span class="token punctuation">.</span><span class="token function">getAge</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">&gt;</span> e2<span class="token punctuation">.</span><span class="token function">getAge</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token number">1</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span>
        <span class="token keyword">return</span> <span class="token operator">-</span><span class="token number">1</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">collect</span><span class="token punctuation">(</span><span class="token class-name">Collectors</span><span class="token punctuation">.</span><span class="token function">toList</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div><h2 id="写在最后"><a href="#写在最后" class="header-anchor">#</a> 写在最后</h2> <blockquote><p>如果你觉得冰河写的还不错，请微信搜索并关注「 <strong>冰河技术</strong> 」微信公众号，跟冰河学习高并发、分布式、微服务、大数据、互联网和云原生技术，「 <strong>冰河技术</strong> 」微信公众号更新了大量技术专题，每一篇技术文章干货满满！不少读者已经通过阅读「 <strong>冰河技术</strong> 」微信公众号文章，吊打面试官，成功跳槽到大厂；也有不少读者实现了技术上的飞跃，成为公司的技术骨干！如果你也想像他们一样提升自己的能力，实现技术能力的飞跃，进大厂，升职加薪，那就关注「 <strong>冰河技术</strong> 」微信公众号吧，每天更新超硬核技术干货，让你对如何提升技术能力不再迷茫！</p></blockquote> <p><img alt="" data-src="https://img-blog.csdnimg.cn/20200906013715889.png" loading="lazy" class="lazy"></p></div> <footer class="page-edit"><div class="edit-link"><a href="https://github.com/binghe001/BingheGuide/edit/master/docs/md/core/java/java8/2022-03-31-010-Stream API有哪些中间操作,看完你也可以吊打面试官.md" target="_blank" rel="noopener noreferrer">在 GitHub 上编辑此页</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <div class="last-updated"><span class="prefix">上次更新: </span> <span class="time">2022/5/23</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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class="toc-sidebar-link">Stream的中间操作</a><ul class="toc-sidebar-sub-headers"></ul></li><li><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#筛选与切片" class="toc-sidebar-link">筛选与切片</a><ul class="toc-sidebar-sub-headers"><li class="toc-sidebar-sub-header"><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#_1-filter-方法" class="toc-sidebar-link">1.filter()方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#_2-limit-方法" class="toc-sidebar-link">2.limit()方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#_3-skip-方法" class="toc-sidebar-link">3.skip()方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#_4-distinct-方法" class="toc-sidebar-link">4.distinct()方法</a></li></ul></li><li><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#映射" class="toc-sidebar-link">映射</a><ul class="toc-sidebar-sub-headers"><li class="toc-sidebar-sub-header"><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#_1-map-方法" class="toc-sidebar-link">1.map()方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#_2-flatmap" class="toc-sidebar-link">2.flatMap()</a></li></ul></li><li><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#排序" class="toc-sidebar-link">排序</a><ul class="toc-sidebar-sub-headers"></ul></li><li><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#写在最后" class="toc-sidebar-link">写在最后</a><ul class="toc-sidebar-sub-headers"></ul></li></ul></div></div></div></div></div> <div class="option-box-toc-over"><img src="/images/system/toc.png" class="nozoom"> <span class="show-txt">目录</span> <div class="toc-container"><div class="pos-box"><div class="icon-arrow"></div> <div class="scroll-box" style="max-height:550px"><div style="font-weight:bold;text-align:center;">Stream API有哪些中间操作？看完你也可以吊打面试官！！</div> <hr> <div class="toc-box"><ul class="toc-sidebar-links"><li><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#写在前面" class="toc-sidebar-link">写在前面</a><ul class="toc-sidebar-sub-headers"></ul></li><li><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#stream的中间操作" class="toc-sidebar-link">Stream的中间操作</a><ul class="toc-sidebar-sub-headers"></ul></li><li><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#筛选与切片" class="toc-sidebar-link">筛选与切片</a><ul class="toc-sidebar-sub-headers"><li class="toc-sidebar-sub-header"><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#_1-filter-方法" class="toc-sidebar-link">1.filter()方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#_2-limit-方法" class="toc-sidebar-link">2.limit()方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#_3-skip-方法" class="toc-sidebar-link">3.skip()方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#_4-distinct-方法" class="toc-sidebar-link">4.distinct()方法</a></li></ul></li><li><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#映射" class="toc-sidebar-link">映射</a><ul class="toc-sidebar-sub-headers"><li class="toc-sidebar-sub-header"><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#_1-map-方法" class="toc-sidebar-link">1.map()方法</a></li><li class="toc-sidebar-sub-header"><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#_2-flatmap" class="toc-sidebar-link">2.flatMap()</a></li></ul></li><li><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#排序" class="toc-sidebar-link">排序</a><ul class="toc-sidebar-sub-headers"></ul></li><li><a href="/md/core/java/java8/2022-03-31-010-Stream%20API%E6%9C%89%E5%93%AA%E4%BA%9B%E4%B8%AD%E9%97%B4%E6%93%8D%E4%BD%9C,%E7%9C%8B%E5%AE%8C%E4%BD%A0%E4%B9%9F%E5%8F%AF%E4%BB%A5%E5%90%8A%E6%89%93%E9%9D%A2%E8%AF%95%E5%AE%98.html#写在最后" class="toc-sidebar-link">写在最后</a><ul class="toc-sidebar-sub-headers"></ul></li></ul></div></div></div></div></div> <div class="option-box"><img src="/images/system/wechat.png" class="nozoom"> <span class="show-txt">手机看</span> <div class="toc-container"><div class="pos-box"><div class="icon-arrow"></div> <div class="scroll-box" style="text-align:center"><span style="font-size:0.9rem">微信扫一扫</span> 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